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68 lines
1.4 KiB
Markdown
68 lines
1.4 KiB
Markdown
---
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title: merge
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description: "Returns the result of merging two or more maps."
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categories: [functions]
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menu:
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docs:
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parent: functions
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keywords: [collections]
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signature: ["collections.Merge MAP MAP...", "merge MAP MAP..."]
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relatedfuncs: [dict, append, reflect.IsMap, reflect.IsSlice]
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---
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Returns the result of merging two or more maps from left to right. If a key already exists, `merge` updates its value. If a key is absent, `merge` inserts the value under the new key.
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Key handling is case-insensitive.
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The following examples use these map definitions:
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```go-html-template
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{{ $m1 := dict "x" "foo" }}
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{{ $m2 := dict "x" "bar" "y" "wibble" }}
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{{ $m3 := dict "x" "baz" "y" "wobble" "z" (dict "a" "huey") }}
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```
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Example 1
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```go-html-template
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{{ $merged := merge $m1 $m2 $m3 }}
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{{ $merged.x }} → baz
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{{ $merged.y }} → wobble
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{{ $merged.z.a }} → huey
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```
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Example 2
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```go-html-template
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{{ $merged := merge $m3 $m2 $m1 }}
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{{ $merged.x }} → foo
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{{ $merged.y }} → wibble
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{{ $merged.z.a }} → huey
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```
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Example 3
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```go-html-template
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{{ $merged := merge $m2 $m3 $m1 }}
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{{ $merged.x }} → foo
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{{ $merged.y }} → wobble
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{{ $merged.z.a }} → huey
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```
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Example 4
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```go-html-template
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{{ $merged := merge $m1 $m3 $m2 }}
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{{ $merged.x }} → bar
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{{ $merged.y }} → wibble
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{{ $merged.z.a }} → huey
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```
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{{% note %}}
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Regardless of depth, merging only applies to maps. For slices, use [append](/functions/append).
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{{% /note %}}
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